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when i want to install it , it wont and asking for SApassword and it says enter that , BUT where i supposed to enter that password.
thanks

I've installed SP3 plenty of times and have ALWAYS been able to specify the user account (and password) with which to install the service pack. If for some reason you can't work it out, you can install using a Windows Administrator-level account (e.g. the "Administrator" account itself) instead of the SQL Server SA account.